src/modules/m_cap.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2015 Attila Molnar <attilamolnar@hush.com>
   5  *
   6  * This file is part of InspIRCd.  InspIRCd is free software: you can
   7  * redistribute it and/or modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation, version 2.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include "inspircd.h"
  21 #include "modules/cap.h"
  22
  23 namespace Cap
  24 {
  25         class ManagerImpl;
  26 }
  27
  28 class Cap::ManagerImpl : public Cap::Manager
  29 {
  30         typedef insp::flat_map<std::string, Capability*, irc::insensitive_swo> CapMap;
  31
  32         ExtItem capext;
  33         CapMap caps;
  34
  35         static bool CanRequest(LocalUser* user, Ext usercaps, Capability* cap, bool adding)
  36         {
  37                 if ((usercaps & cap->GetMask()) == adding)
  38                         return true;
  39
  40                 return cap->OnRequest(user, adding);
  41         }
  42
  43         Capability::Bit AllocateBit() const
  44         {
  45                 Capability::Bit used = 0;
  46                 for (CapMap::const_iterator i = caps.begin(); i != caps.end(); ++i)
  47                 {
  48                         Capability* cap = i->second;
  49                         used |= cap->GetMask();
  50                 }
  51
  52                 for (unsigned int i = 0; i < MAX_CAPS; i++)
  53                 {
  54                         Capability::Bit bit = (1 << i);
  55                         if (!(used & bit))
  56                                 return bit;
  57                 }
  58                 throw ModuleException("Too many caps");
  59         }
  60
  61  public:
  62         ManagerImpl(Module* mod)
  63                 : Cap::Manager(mod)
  64                 , capext("caps", ExtensionItem::EXT_USER, mod)
  65         {
  66         }
  67
  68         ~ManagerImpl()
  69         {
  70                 for (CapMap::iterator i = caps.begin(); i != caps.end(); ++i)
  71                 {
  72                         Capability* cap = i->second;
  73                         cap->Unregister();
  74                 }
  75         }
  76
  77         void AddCap(Cap::Capability* cap) CXX11_OVERRIDE
  78         {
  79                 // No-op if the cap is already registered.
  80                 // This allows modules to call SetActive() on a cap without checking if it's active first.
  81                 if (cap->IsRegistered())
  82                         return;
  83
  84                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Registering cap %s", cap->GetName().c_str());
  85                 cap->bit = AllocateBit();
  86                 cap->extitem = &capext;
  87                 caps.insert(std::make_pair(cap->GetName(), cap));
  88         }
  89
  90         void DelCap(Cap::Capability* cap) CXX11_OVERRIDE
  91         {
  92                 // No-op if the cap is not registered, see AddCap() above
  93                 if (!cap->IsRegistered())
  94                         return;
  95
  96                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Unregistering cap %s", cap->GetName().c_str());
  97
  98                 // Turn off the cap for all users
  99                 const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
 100                 for (UserManager::LocalList::const_iterator i = list.begin(); i != list.end(); ++i)
 101                 {
 102                         LocalUser* user = *i;
 103                         cap->set(user, false);
 104                 }
 105
 106                 cap->Unregister();
 107                 caps.erase(cap->GetName());
 108         }
 109
 110         Capability* Find(const std::string& capname) const CXX11_OVERRIDE
 111         {
 112                 CapMap::const_iterator it = caps.find(capname);
 113                 if (it != caps.end())
 114                         return it->second;
 115                 return NULL;
 116         }
 117
 118         bool HandleReq(LocalUser* user, const std::string& reqlist)
 119         {
 120                 Ext usercaps = capext.get(user);
 121                 irc::spacesepstream ss(reqlist);
 122                 for (std::string capname; ss.GetToken(capname); )
 123                 {
 124                         bool remove = (capname[0] == '-');
 125                         if (remove)
 126                                 capname.erase(capname.begin());
 127
 128                         Capability* cap = ManagerImpl::Find(capname);
 129                         if ((!cap) || (!CanRequest(user, usercaps, cap, !remove)))
 130                                 return false;
 131
 132                         if (remove)
 133                                 usercaps = cap->DelFromMask(usercaps);
 134                         else
 135                                 usercaps = cap->AddToMask(usercaps);
 136                 }
 137
 138                 capext.set(user, usercaps);
 139                 return true;
 140         }
 141
 142         void HandleList(std::string& out, LocalUser* user, bool show_all, bool minus_prefix = false) const
 143         {
 144                 Ext show_caps = (show_all ? ~0 : capext.get(user));
 145
 146                 for (CapMap::const_iterator i = caps.begin(); i != caps.end(); ++i)
 147                 {
 148                         Capability* cap = i->second;
 149                         if (!(show_caps & cap->GetMask()))
 150                                 continue;
 151
 152                         if ((show_all) && (!cap->OnList(user)))
 153                                 continue;
 154
 155                         if (minus_prefix)
 156                                 out.push_back('-');
 157                         out.append(cap->GetName()).push_back(' ');
 158                 }
 159         }
 160
 161         void HandleClear(LocalUser* user, std::string& result)
 162         {
 163                 HandleList(result, user, false, true);
 164                 capext.unset(user);
 165         }
 166 };
 167
 168 class CommandCap : public SplitCommand
 169 {
 170         Cap::ManagerImpl manager;
 171
 172         static void DisplayResult(LocalUser* user, std::string& result)
 173         {
 174                 if (result.size() > 5)
 175                         result.erase(result.end()-1);
 176                 user->WriteCommand("CAP", result);
 177         }
 178
 179  public:
 180         LocalIntExt holdext;
 181
 182         CommandCap(Module* mod)
 183                 : SplitCommand(mod, "CAP", 1)
 184                 , manager(mod)
 185                 , holdext("cap_hold", ExtensionItem::EXT_USER, mod)
 186         {
 187                 works_before_reg = true;
 188         }
 189
 190         CmdResult HandleLocal(const std::vector<std::string>& parameters, LocalUser* user) CXX11_OVERRIDE
 191         {
 192                 if (user->registered != REG_ALL)
 193                         holdext.set(user, 1);
 194
 195                 std::string subcommand(parameters[0].length(), ' ');
 196                 std::transform(parameters[0].begin(), parameters[0].end(), subcommand.begin(), ::toupper);
 197
 198                 if (subcommand == "REQ")
 199                 {
 200                         if (parameters.size() < 2)
 201                                 return CMD_FAILURE;
 202
 203                         std::string result = (manager.HandleReq(user, parameters[1]) ? "ACK :" : "NAK :");
 204                         result.append(parameters[1]);
 205                         user->WriteCommand("CAP", result);
 206                 }
 207                 else if (subcommand == "END")
 208                 {
 209                         holdext.unset(user);
 210                 }
 211                 else if ((subcommand == "LS") || (subcommand == "LIST"))
 212                 {
 213                         const bool is_ls = (subcommand.length() == 2);
 214
 215                         std::string result = subcommand + " :";
 216                         manager.HandleList(result, user, is_ls);
 217                         DisplayResult(user, result);
 218                 }
 219                 else if (subcommand == "CLEAR")
 220                 {
 221                         std::string result = "ACK :";
 222                         manager.HandleClear(user, result);
 223                         DisplayResult(user, result);
 224                 }
 225                 else
 226                 {
 227                         user->WriteNumeric(ERR_INVALIDCAPSUBCOMMAND, "%s :Invalid CAP subcommand", subcommand.c_str());
 228                         return CMD_FAILURE;
 229                 }
 230
 231                 return CMD_SUCCESS;
 232         }
 233 };
 234
 235 class ModuleCap : public Module
 236 {
 237         CommandCap cmd;
 238
 239  public:
 240         ModuleCap()
 241                 : cmd(this)
 242         {
 243         }
 244
 245         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
 246         {
 247                 return (cmd.holdext.get(user) ? MOD_RES_DENY : MOD_RES_PASSTHRU);
 248         }
 249
 250         Version GetVersion() CXX11_OVERRIDE
 251         {
 252                 return Version("Provides support for CAP capability negotiation", VF_VENDOR);
 253         }
 254 };
 255
 256 MODULE_INIT(ModuleCap)